多个Elasticsearch节点无法自动组成集群，查看日志发现错误信息：“master_not_discovered_exception”。
原因是运维人员通过克隆虚拟机来获得多台Elasticsearch服务器，这样每个Elasticsearch节点都具有相同的节点ID，因此在组成集群时，无法选举出master节点。
这可以通过以下命令进行验证，列出所有节点ID：
GET /_cat/nodes?v&h=id,ip,name&full_id=true
请注意，由于Elasticsearch集群尚未形成，因此需要单独查询每个节点，即：
curl 192.168.110.111:9200/_cat/nodes?v&h=id,ip,name&full_id=true
curl 192.168.110.112:9200/_cat/nodes?v&h=id,ip,name&full_id=true
......Elasticsearch节点ID必须是唯一的。要解决这个问题，我们需要删除每个节点上的索引（RPM方式安装的Elasticsearch的索引数据默认位于/var/lib/elasticsearch）。重启Elasticsearch就会重置节点ID。
参考
https://www.656463.com/wenda/jdbhjrjqNotMasterExceptionqgddxc_359
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